These accounts were told as stories or fables to make them easier to remember and pass down. That’s how they did it 10,000 years ago. You would think that people today would be intelligent enough to understand this concept but apparently not.
I am not sure how you are dating the various flood accounts in most ancient writings from all parts of the planet. Many are similar on various key points but only the Biblical account can be confirmed by scientific study. The other stories are too similar to be coincidence.
A few links on the many flood accounts:
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"Anthropologists have collected as many as 270 flood legends from nearly all tribes and nations. “The flood story is found throughout the world,” says scholar Claus Westermann. “Like the creation narrative, it is part of our basic cultural heritage. It is truly astonishing: everywhere on earth we find stories of a great primeval flood.” The explanation? Says expositor Enrico Galbiati: “The insistent presence of a flood tradition in different and widely separated peoples is a sign of the historical reality of the fact that lies at the base of such traditions.”
From our Bible dictionary:
This is an authorized Web site of Jehovah’s Witnesses. It is a research tool for publications in various languages produced by Jehovah’s Witnesses.
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"These folklore accounts of the Deluge agree with some major features of the Biblical account: (1) a place of refuge for a few survivors, (2) an otherwise global destruction of life by water, and (3) a seed of mankind preserved. The Egyptians, the Greeks, the Chinese, the Druids of Britain, the Polynesians, the Eskimos and Greenlanders, the Africans, the Hindus, and the American Indians—all of these have their Flood stories.
The International Standard Bible Encyclopedia (Vol. 2, p. 319) states: “Flood stories have been discovered among nearly all nations and tribes. Though most common on the Asian mainland and the islands immediately south of it and on the North American continent, they have been found on all the continents. Totals of the number of stories known run as high as about 270 . . . The universality of the flood accounts is usually taken as evidence for the universal destruction of humanity by a flood and the spread of the human race from one locale and even from one family. Though the traditions may not all refer to the same flood, apparently the vast majority do. The assertion that many of these flood stories came from contacts with missionaries will not stand up because most of them were gathered by anthropologists not interested in vindicating the Bible, and they are filled with fanciful and pagan elements evidently the result of transmission for extended periods of time in a pagan society. Moreover, some of the ancient accounts were written by people very much in opposition to the Hebrew-Christian tradition.”—Edited by G. Bromiley, 1982."
This is an authorized Web site of Jehovah’s Witnesses. It is a research tool for publications in various languages produced by Jehovah’s Witnesses.
wol.jw.org
"
[Chart on page 4]
(For fully formatted text, see publication)
Flood Legends Worldwide
Country Correspondencies 1 2 3 4 5 6 7 8 9 10
Greece 7 ◆ ◆ ◆ ◆ ◆ ◆
◆
Rome 6 ◆ ◆ ◆ ◆ ◆ ◆
Lithuania 6 ◆ ◆ ◆ ◆ ◆ ◆
Assyria 9 ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆
Tanzania 7 ◆ ◆ ◆ ◆ ◆ ◆ ◆
Lithuania 6 ◆ ◆ ◆ ◆ ◆ ◆
Assyria 9 ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆
Tanzania 7 ◆ ◆ ◆ ◆ ◆ ◆ ◆
India - Hindu 6 ◆ ◆ ◆ ◆ ◆ ◆
New Zealand - Maori 5 ◆ ◆ ◆ ◆ ◆
Micronesia 7 ◆ ◆ ◆ ◆ ◆ ◆ ◆
Washington U.S.A. - Yakima 7 ◆ ◆ ◆ ◆ ◆ ◆ ◆
Mississippi U.S.A. - Choctaw 7 ◆ ◆ ◆ ◆ ◆ ◆ ◆
Mexico - Michoacan 5 ◆ ◆ ◆ ◆ ◆
South America - Quechua 4 ◆ ◆ ◆ ◆
Bolivia - Chiriguano 5 ◆ ◆ ◆ ◆ ◆
Guyana - Arawak 6 ◆ ◆ ◆ ◆ ◆ ◆
1: God angered by wickedness
2: Destruction by a flood
3: Ordered by God
4: Divine warning given
5: Few of mankind survive
6: Saved in a vessel
7: Animals saved
8: Bird or other creature sent out
9: Finally comes to rest on a mountain
10: Sacrifice offered"